Crocus is grown for its root. It's hardy across USDA zones 3 through 8 and grows just as well in a container as in the ground. Its summer flowers are a real draw for honeybees and native bees, even though the root is the prize.
Crocus — the short answer
Crocus: grown in zones 3–8, full sun, pH 5.5–7.8.
- USDA zones
- 3–8
- Manual horticultural correction (source not retained); NC State Extension and Missouri Botanical Garden, with the remaining rows from other published sources or Growable Ground compilation
- Soil pH
- 5.5–7.8
- FAO ECOCROP
- Sun
- Full Sun
- Growable Ground Plant Database
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — each tile names its own row's source, because per-field provenance varies.
Score Crocus on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether crocus actually takes — and those shift from one yard to the next. Enter your address and we'll score crocus against your land's real conditions.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
What Crocus is
Crocus reaches around 6 inches at maturity. It blooms in summer. It's also well suited to containers.
How to grow Crocus
Crocus grows in USDA zones 3 through 8. Crocus does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5.5 to 7.8, on well-drained ground. It needs a growing season of at least 180 frost-free days, which is why climate matters as much as soil.
USDA Zones
3-8
USDA PHZM 2023
Soil pH
5.5 - 7.8
FAO ECOCROP
Sun
Full Sun
Growable Ground plant catalog
Drainage
well (dry spells)
Growable Ground plant catalog
Minimum Growing Temperature
39.2°F
Below this it stops growing rather than dies — a pace limit, not a survival limit.
FAO ECOCROP
Mature Height
0.5 ft
Growable Ground plant catalog
Frost-Free Days
180+
The frost-free stretch it needs start to finish — short-season areas may need an indoor head start.
Growable Ground plant catalog
Sow directly
Sow crocus seed straight into the bed — root crops germinate fast and resent transplanting. Give them full sun.
Match the soil
Crocus prefers pH 5.5 to 7.8 (FAO ECOCROP). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at maturity
Pull while roots are young and tender — sweeter than oversized ones. Local Cooperative Extension guides publish timing tables.
Where Crocus thrives
Crocus is hardy across USDA zones 3 through 8. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
A USDA zone is a 10°F band of average annual extreme winter minimum, so zones 3–8 spans average winter lows from -40°F to 20°F (USDA PHZM 2023). Across the 50 states and DC, that band covers 34 outright and splits 17 more down the middle — and which side of that line your land sits on changes the answer.
Zones 3–8·Where Crocus growsOpen map →
Where Crocus stands, state by state
Crocus is rated for zones 3–8 — a cold floor USDA puts at -40 to -30°F. Across the 50 states and DC, 34 sit fully inside that band, the line runs through 17 more, and 0 sit outside it — and inside every split state, the same line runs on at county grain.
Fully inside zones 3–8
34 states
3 of 34 shown
The line runs through
17 states
- Alaska · zones 1a-9a
- California · zones 4b-11a
- Nevada · zones 4a-10a
3 of 17 shown
Crocus’s band covers part of each of these states — which side of the line your county sits on changes the answer, and each state page draws it.
State zone extents: USDA Plant Hardiness Zone Map (PHZM) 2023. A zone is a 10°F band of average annual extreme minimum temperature, so a state that splits the band contains the boundary — its own page draws the county line, and a parcel report resolves which side your land sits on.
What grows around Crocus
Growing guides for crocus
In rotation planning, crocus counts as a Other — beds recover best when other crops don’t follow each other in the same spot year over year. (Growable Ground derivation — crop-rotation group from botanical family)
Related plants in perennial flower
Good to know
Good news for pet owners — crocus isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Crocus is a standout pollinator plant — high value to bees and other pollinators. (Source: Xerces Society.)
Your land is one point inside Crocus's range
This page resolves to the species. Your state page draws the county line, and a report reads the parcel — the soil pH, drainage, sun, and frost dates on your exact ground, which no species average can see.
See if Crocus will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether crocus actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
How we know this about Crocus
The figures above are cited per row, not per site: the pH band names this plant’s own source column, the three temperature figures each carry their own, and days-to-maturity cites the publication that actually lists it. All of it comes from the Growable Ground Plant Database — a compilation over FAO ECOCROP, USDA PLANTS, and university Extension sources, published openly with per-field provenance.
Grounded inUSDA PLANTS Database•USDA PHZM•ASPCA
Frequently asked questions
Can I grow Crocus in my zone?
Crocus grows in USDA hardiness zones 3 through 8 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
When should you plant Crocus?
Crocus is a cool-season crop, so it goes in during the cool halves of the year — early spring, and again in late summer for a fall planting — rather than at the height of summer heat. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Crocus need?
Crocus needs full sun — a spot that catches at least 6 hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Crocus need?
Crocus prefers soil pH 5.5 to 7.8, on well-drained ground (FAO ECOCROP). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Crocus attract pollinators?
Yes — crocus's flowers are a strong nectar and pollen source for honeybees and native bees. (Source: Xerces Society.)
Is Crocus safe for pets?
Crocus is not known to be toxic to dogs or cats based on available data. Always supervise pets around new plantings. (Source: ASPCA.)